if student cbse class10th fail in math subject and passed in additional subject Sanskrit.so result pass or fail can additional subject Sanskrit replace maths number.
Hey student,
You have to give re-examination for the maths but you can take marks of your top 5 subjects for the best percentage but English is compulsory to take in it.
All the best student,
Hope this helps you.
https://school.careers360.com/exams/cbse-class-10th/amp